This is a nice looking project, with the focus seemingly being on drivers for common devices. (On the other hand, after having looked at Oberon, Inferno, and ChrysaLisp, if I were to embark on such an undertaking, I would rather let my imagination run wild and try to create something completely alien and fun to explore even at the UI level.)
Have a look at Mesa/Cedar as well. Those OSes have explored only a subset of its ideas.